Grief is a very simple process that everybody experiences in exactly the same way.
Wrong. I speak from experience. I'm autistic and don't experience emotions the same way as most do at all, because my brain is damaged. I've lost both my grandparents and two best friends; never felt any denial over it, because there was no denying that it happened. I didn't feel angry, because there wasn't anyone to be angry at. I didn't try bargaining, because I knew they were never coming back, so there'd be no point to bargaining with anyone for them to come back from the dead. I didn't feel depressed, because I knew they were going to die sooner or later. People die all the time. The only stage of "grief" I felt was Acceptance, because life is busy, I have things to do, and that's all I could do. Move on. Some called me a monster for my reaction (or lack thereof, rather). That just made me feel Confused, because clearly I'm a human being.
I just don't experience emotions the same way other people do, and my face just has a flat-affect to it just about 24/7. I don't understand a lot of things people seem to take for granted. Jokes, sarcasm, metaphores, social niceties and norms, et cetera. They all just kind of go over my head.
I'd even propose that
nobody experiences emotions the exact same way as the next person. People are different from one another. There's no two exactly alike because we all have different experiences in life, so we're all wired differently to one degree or another, some moreso than others. I recall a saying that goes something like "You have to laugh to keep from crying." Not quite sure what that means, but I think I've witnessed it a couple times. I remember finding it really weird.